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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '127170fb310c4cb6d9adcfef5a9669e0e7077ddbf75f9abb8f351b672d818316' 
  AND token = 'l5aM1u1ZtXZGO0bNf+jwKLVgEDb93u/fUKXXFovnAsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}